Can I ask where you got these stats for your Toxtricity?Mega Stat Changes: 70 / 130 / 65 (-5) / 145 (+16) / 65 (-5) / 130 (+43)
Your stat changes suggest that you were comparing it to something with a spread of 70/130/70/129/70/87, but that's neither base Toxtricity nor Mega Toxtricity (nor any official Pokémon, for that matter - 556 is an unused base stat total), and the changes themselves don't add up to 100.
Base Toxtricity is 75/98/70/114/70/75, and Mega Toxtricity is 75/111/100/129/100/87. It seems you've gotten your Defense and Special Defense from Toxtricity and your Special Attack and Speed from Mega Toxtricity, while your HP and Attack don't match either one (remember that HP isn't allowed to change for a Mega Evolution!).
Your base stat total is also off - not by a great margin (it's only three points higher than it should be), but with how little sense this spread already seems to make, it does support that you may have confused a few things when you were making this.
You might want to look this over and double-check that you've put the stats you meant!
(Your Gengar spread makes more sense, but your stat changes aren't quite accurate - you've noted its Special Defense buff as +15, while it's actually +20. This one seems to have the right total, though! You just mislabeled it.
For reference, the stat changes listed for this Mega Gengar spread are by comparison to our existing Mega Gengar X, not to base Gengar.)